<!DOCTYPE html>
<html lang="zh_CN">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .box {
            display: flex;


            width: 500px;
            height: 500px;
            border: 1px solid red;
        }

        .box1 {
            align-self: flex-end;

            width: 100px;
            height: 100px;
            background-color: #f00;
        }

        .box2 {

            width: 100px;
            height: 100px;
            background-color: #0f0;
        }

        .box3 {
            /*align-self: flex-end;*/
            align-self: center;

            width: 100px;
            height: 100px;
            background-color: #00f;
        }


    </style>
</head>
<body>
<div class="box">
    <div class="box1"></div>
    <div class="box2"></div>
    <div class="box3"></div>
</div>
</body>
<script type="text/javascript">

</script>

</html>
